Mozilla Firefox/Platform Engineering Update 39.1

This engineering update is also available on the Platform/2015-03-17 wiki.

Firefox Release Schedule

Only two weeks and two beta builds until Firefox Beta 37 is released. The Tracking Firefox dashboard shows tracked bugs for the Aurora and Beta releases.


RyanVM sends a major shout out to Tim Taubert for being on an orange fixing tear last week.


Mike Hommey enabled jemalloc3 (bug 762449) on Nightly. It’s configured to not ride the trains for now. There are a number of perf regressions and crashes that Mike is diligently working through.


The media team is close to shipping Media Source Extensions (MSE bug 1083588) for YouTube. MSE improves HTML5 video performance as YouTube transitions its default video player from Flash to HTML5 video. The team plans to ship MSE on Windows in Firefox 37, OS X in Firefox 38, and then Linux. Be on the look out for any YouTube bugs, such as videos that won’t load or get stuck rebuffering.


Telemetry and FHR measurements were unified into a single system on Nightly 39 (bug 1069869). The old FHR will still be around for a couple of releases. The unified Telemetry client-side is still being stabilized, so Telemetry from Nightly 39 isn’t reliable yet. Be very careful when interpreting Nightly 39 data!

The unified Telemetry pings are sent to a new Telemetry backend (DataPipeline) which will support streaming analyses. The Telemetry wiki is now up to date with information about Telemetry client-side & server-side workings. We added a Telemetry errata page to help with analyzing Telemetry data.

Many Telemetry histograms will automatically expire in Firefox 40. Check Histograms.json to see if the expiry version of your telemetry probes should updated.

Test results comparing e10s vs non-e10s Talos scores and an explanatory blog post are coming soon. Results in very raw form:

Aaron Klotz created a tool for visualizing Windows attached input queues, as detailed on his blog. Attached input queues can cause odd problems like bug 1105386 where a page won’t load or render if the mouse is not moving.

With bug 1128768, we can now gather information about the amount of jank caused by different types of Flash content. This will be used to quantify the benefit of targeting Shumway at different types of Flash content.

Per-compartment CPU accounting (bug 674779) should land in the next week or two. Use it to report add-ons that use too much CPU or CPOWs (e.g. bug 1136923).


The team’s current focus is playing Flash ads in Shumway instead of Flash. Using Shumway will reduce the number of Flash plugin instantiations, which is correlated with Flash deadlocks, and reduce page jank. Flash ads have also exploited Flash security bugs to install malware. Shumway should protect against many of those exploits.

Shumway now plays IMDb trailer videos on Nightly (bug 1137433) and substantial progress is being made on a verifiable sandboxed. An implementation of AS3’s meta-object protocol that should be pretty faithful to Flash’s an a new Shumway interpreter should land soon. This enables proper handling of SecurityDomains, a crucial Flash security feature.

cialis online levitra 20 mg how to take cialis viagra coupon discount viagra viagra pills cialis free trial viagra substitute cialis without a doctor’s prescription cheap viagra cialis tadalafil levitra prices viagra dose cvs pharmacy viagra coupons cialis price levitra canada cialis 20mg directions buy cialis online cialis for women free cialis generic cialis tadalafil cialis dosage strengths buy levitra online cialis medication cialis patent expiration what is cialis cialis testimonials cialis 30 day trial coupon levitra cost viagra vs cialis healthy man viagra price cialis levitra coupons cialis dosage cialis coupons cialis pills for sale viagra samples cealis is viagra government funded in america cialis vs viagra viagra porn over the counter viagra cialis reviews how long does levitra last cialis patent expiration 2017 cialis otc cialis coupon 20 mg cialis for sale cialis coupons printable viagra activate cialis coupons 2017 viagra sex viagra girls how much does cialis cost buy viagra viagra price canadian viagra side effects of cialis non prescribed viagra cost of viagra viagra without a doctor prescription usa natural viagra viagra savings offer liquid cialis generic levitra levitra 20 mg cost walmart cialis vs viagra levitra viagra coupons 75 off levitra vs viagra cialis trial viagra pills for sale erectile dysfunction cialis canada viagra how does viagra work cialis 5mg buy viagra online generic viagra viagra from amazon cialis side effects cheap cialis cilias cialis samples overnight cialis alternative cialis pharmacy prices cialis 10 mg cialis effects cialis coupon viagra cialis levitra 20mg wholesale cialis pfizer viagra is viagra funded by government viagra prices without insurance generic for cialis what is levitra where to buy viagra levitra vs viagra for hardness cialis pricing viagra single packs cost levitra loc us levitra side effects cialis for daily use female viagra pills viagra ingredients viagra on line no prec viagra generic cost of levitra discount cialis side effects of viagra pfizer viagra coupons cialis 30 day sample viagra coupons online cialis trial viagra sample viagra without prescription levitra without a doctor prescription levitra coupon daily cialis levitra vs viagra viagra generic cialis at walmart canada cialis viagra costs cialis pills levitra reviews how does cialis work levitra 10 mg generic for viagra viagra online cialis professional viagra from canada best price viagra herbal viagra viagra prices viagra vs cialis vs levitra viagra vs cialis otc viagra viagra cost viagra single packs viagra for women cialis generic tadalafil does viagra work women viagra how much does viagra cost viagra 100mg price walmart viagra government funded revatio vs viagra cialis 20mg cialis daily viagra for sale cialis from canada viagra coupons from pfizer viagra alternatives cialis canadian pharmacy cialis voucher cialis copay card cialis dosage recommendations utilisation viagra levitra vs cialis is viagra government funded viagra patent expiration viagra without a doctor prescription levitra generic 9 levitra at walmart cialis coupon print cialis 5mg daily cialis samples viagra side effects sildenafil vs viagra cialis sample cialis 5 mg generic viagra available in usa viagra on line cialis prices viagra best price cialis generic viagra 100mg tablets retail price cialis discount levitra 10mg cialis on line cialis cialis for men 200 cialis coupon viamedic cialis cialas cialis cheap female viagra sex viagra for women cialis or viagra sophia viagra viagra pharmacy cialis cost natural viagra alternatives that work cyalis cialis or viagra cialis savings card buy cialis lowest cialis prices cialis canada how long does viagra last online viagra levitra dosage stendra vs viagra cialis website generic viagra 100mg when will cialis go generic is viagra covered by insurance is viagra federally funded what is viagra cialis coupons from manufacturer cialis for bph viagra dosage cost of cialis cialis 20 mg viagra pill order online viagra viagra government funding levitra online cialis generic availability inexpensive viagra pills what does viagra do canadian cialis viagra canada walgreens viagra substitute generic cialis cialis patent expiration date extended buy levitra free viagra viagra vs cialis vs levitra does the government fund viagra